b = realRegions(A, R)
This method computes the number of regions cut out by the hyperplane arrangement.
i1 : R = RR[x,y];
i2 : A = {x+y,x,x-y,y+1};
i3 : realRegions(A, R) -- warning: experimental computation over inexact field begun -- results not reliable (one warning given per session) o3 = 10
The object realRegions is a method function.